EP1269784B1 - Transfert dans un reseau de communication radio commute par paquets - Google Patents

Transfert dans un reseau de communication radio commute par paquets Download PDF

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Publication number
EP1269784B1
EP1269784B1 EP01914314A EP01914314A EP1269784B1 EP 1269784 B1 EP1269784 B1 EP 1269784B1 EP 01914314 A EP01914314 A EP 01914314A EP 01914314 A EP01914314 A EP 01914314A EP 1269784 B1 EP1269784 B1 EP 1269784B1
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EP
European Patent Office
Prior art keywords
base station
packet
mobile station
handover
target base
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP01914314A
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German (de)
English (en)
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EP1269784A2 (fr
Inventor
Susanne Ahlstrand
Lars Tedenvall
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of EP1269784A2 publication Critical patent/EP1269784A2/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present invention relates generally to the field of wireless communications; and, more specifically, to a method for performing a handover between two cells in a packet switched wireless system.
  • IP Internet protocol
  • GPRS is a packet switched system that uses the same physical carrier structure as the present GSM cellular communications system, and that is designed to coexist with and to provide the same coverage as GSM.
  • GPRS radio interface is thus based on a TDMA (Time Division Multiple Access) structured system with 200 kHz carriers divided into eight timeslots with GMSK (Gaussian Minimum Shift Keying) modulation.
  • TDMA Time Division Multiple Access
  • GMSK Gausian Minimum Shift Keying
  • the GPRS specifications include a number of different coding schemes to be used depending on the quality of the radio carrier. With GPRS, data rates well over 100 kbps will be possible.
  • EDGE Enhanced Data rates for Global Evolution
  • GMSK Gaussian Minimum Shift Keying
  • 8PSK 8-symbol Phase Shift Keying
  • EGPRS Enhanced GPRS
  • ECSD Enhanced Circuit Switched Data
  • TDMA/136 the cellular communication system compliant to the ANSI/136 standard, hereinafter referred to as TDMA/136, has focused on a packet data system to be integrated with the TDMA/136 circuit switched mode.
  • This packet data system will also be based on the new EDGE technology as defined for the GPRS extension. It will then allow TDMA/136 operators with a packet data mode to provide data rates up to 384 kbps on 200 kHz carriers with GMSK and 8PSK modulation as defined for EGPRS.
  • a packet switched connection While it is today rather straightforward to establish and maintain a circuit switched connection for voice communications, a packet switched connection is traditionally designed for delay-insensitive data; and, therefore, it is not as straightforward to establish and maintain a packet switched connection for voice communications.
  • Several changes must be made in a packet data system designed for "best-effort" data in order to make it feasible for use in delay sensitive applications such as, for example, voice communications.
  • MS mobile station
  • Handover implies a seamless transfer from one cell to another during an ongoing data transfer.
  • GPRS cell reselection on the other hand, the mobile station disconnects from the old cell before it has new resources allocated in the new cell. This could be compared to cell selection in an idle mode in GSM.
  • the cell reselection decision is made by the mobile station.
  • the mobile station in packet transfer mode measures the signal strength on its own and on neighboring cells.
  • the locating algorithm is in the mobile station, i.e., no measurement reports are sent to the network.
  • the mobile station stops listening to the old cell and starts to read necessary system information in the new cell.
  • the mobile station then accesses the new cell and sends a cell update to the SGSN (Serving GPRS Support Node).
  • the SGSN receives the cell update and discovers that there was already an ongoing downlink packet transfer.
  • the SGSN sends a flush message, containing the addresses of the serving and target cells and the identity of the mobile station, to the PCU (Packet Control Unit) responsible for the old cell.
  • PCU Packet Control Unit
  • unacknowledged LLC Logical Link Control
  • GSM 04.60 Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Mobile Station (MS)-Base Station System (BSS) interface; Radio Link Control/Medium Access Control (RLC/MAC) protocol, v.6.2.0", GSM 05.08: “Digital cellular telecommunications system (Phase 2+); Radio Subsystem link control, v.6.2.0" and 3G TS 23.060: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS); Service description; Stage 2 v 3.2.1".
  • GPRS General Packet Radio Service
  • MS Mobile Station
  • BSS Base Station System
  • RLC/MAC Radio Link Control/Medium Access Control
  • GSM 05.08 “Digital cellular telecommunications system (Phase 2+); Radio Subsystem link control, v.6.2.0" and 3G TS 23.060: "3rd Generation Partnership Project; Technical Specification Group Services and System A
  • the cell change and the LLC moving procedure in packet transfer mode interrupts the transfer by approximately 1-5 seconds, depending on how quickly the mobile station can acquire the full set of system information. This interruption time exceeds the interruption time requirement for speech (100-150 ms) considerably.
  • the target cell resources in the target cell are allocated in advance before the mobile station leaves the old cell. Information about the frequency, timeslot and output power the mobile station should use is sent in the handover command. The mobile station is thus guaranteed resources in the target cell.
  • the mobile station accesses the target cell and receives timing advance information from the target BSS (Base Station System). The handover is controlled by the network, and the mobile station sends measurement reports continuously (two reports every second) on the Slow Associated Control Channel (SACCH).
  • target BSS Base Station System
  • U.S. Patent No. 5,711,003 A discloses a method for performing a handover between two cells in a TDMA cellular mobile radio network in a manner so as to avoid a speech interruption.
  • WO-A 01 63948 (prior art under Art. 54(3) EPC), which corresponds to US patent 7,054,285B2 , the introduction of a Packet SACCH (PSACCH) is disclosed.
  • Measurement reports from the mobile station to the network are sent on the PSACCH in the uplink direction; and system related information, e.g., timing advance value and power control values, is transmitted in the downlink direction.
  • system related information e.g., timing advance value and power control values
  • U.S. Patent 5,711,003A shows a handover procedure in a GSM-system and, in particular, describes that the handover command should include a command for the mobile station not to send any access burst to the new base station. By this and determining the timing advance by the mobile station a shorter interruption time in the procedure can be achieved.
  • This reference is not directed to a combined circuit switched and packed switched system and no handover procedure is described in which both voice and packet switched communication is involved.
  • EP-A-0 699 011 also shows a Handover procedure in a mobile radio system but for circuit-switched (TDMA) system. No handover procedure is described which is directed to a packed switched system in which both voice and packet switched communication is involved.
  • TDMA circuit-switched
  • WO-A-98 15152 shows a handover procedure in a mobile radio system for circuit-switched (TDMA) system.
  • this reference relates to a new Transcoder and Rate adaption unit (TRAU) which provides two uplink and two downlink channels in order to provide for distributed handover.
  • TMA Transcoder and Rate adaption unit
  • This reference also relates to circuit switched mobile radio systems only and no packet switching is described.
  • U.S. Patent 5,940,380A also relates to a circuit-switched system only (see e.g. col. 1, lines 16-46) and describes more in detail how a mobile station can use time slots in an established. No handover procedure is described in a packed switched system and in which both voice and packet switched communication is involved.
  • EP-A-1 045 607 (prior art under Art. 54(3) EPC) like the other references, relates to a handover procedure in a mobile radio system for circuit-switched (TDMA) system. More in detail, it describes that the handover time can be made shorter by letting the target base station get knowledge about control information ("system horrungsam") before the actual handover is taking place (see the Abstract "vorön tone”). No handover procedure is described which is directed to a packed switched system in which both voice and packet switched communication is involved.
  • TDMA circuit-switched
  • the present invention provides a handover procedure for the packet switched domain in order to properly support delay sensitive services, such as voice over IP.
  • a method for handover of a mobile station from a serving base station to a target base station in a packet switched wireless communications system, as defined in Claim 1.
  • the mobile station does not need to use the common control channel, which is a common resource for all users in a cell, to send access messages to the target cell. More specifically, resources are allocated in the uplink and/or downlink direction, between the mobile station and the base station while maintaining the connection between the mobile station and the serving base station, such that a mobile station may reestablish its connection to the network via the target base station in a substantially seamless manner without interrupting an ongoing data transmission session through the connection to the network via the serving base station.
  • the data transmission session may, therefore, be a time sensitive transmission such as, for example, a voice communication session.
  • the communications system comprises a GPRS/EGPRS system
  • the mobile station uses a Packet Data Channel (PDCH) and specifically, the Packet Associated Control Channel (PACCH) to access the target cell.
  • PDCH Packet Data Channel
  • PACCH Packet Associated Control Channel
  • the mobile station uses parts of a traffic channel to transmit necessary information to the network in order to calculate physical parameters. Resources in the target cell are allocated and assigned via the serving cell. More specifically, the mobile station is given necessary information about the new cell, whereby the mobile station is able to immediately transmit information to the network without using the common control channel, shared by all users in a cell.
  • Figure 1 schematically illustrates a cellular pattern, generally designated by reference number 2, according to a GSM or GPRS/EGPRS communications system.
  • Frequencies are typically planned to be used in a certain area, i.e., a first cell, and then re-used in another area, i.e., a second cell, that is distant from the first cell.
  • the planning of frequencies aims to introduce sufficient re-use distance such that communication on, e.g., frequency F1 in one cell 4 does not interfere with communication on the same frequency F1 in another cell 6.
  • a theoretical 1/3 reuse is illustrated where frequencies F1, F2 and F3 are evenly distributed throughout a coverage area, with each frequency serving a sub-area, or cell.
  • the 1/3 reuse indicates that there are 3 different frequencies that are repeated throughout the coverage area.
  • the frequencies may be planned in any reuse, depending on how much spectrum is available. It may also differ within a system, depending on topology and geographical conditions, for example.
  • timeslots are also reused to achieve a two-dimensional re-use, both a frequency and a time re-use.
  • mobile equipment i.e., a mobile station (MS) 10 is illustrated as communicating in one cell 16 with a base station (BS) 12.
  • the MS may continuously measure on surrounding base stations, e.g., BS 14, to find a candidate BS with which to make a handover, in a situation when the serving base station 12 cannot sufficiently maintain the communication. This may happen, e.g., when the mobile station is traveling away from a serving base station 12 and approaching another base station. Measurements may be reported to the network via the serving BS 12, and a handover decision may be made in the network.
  • the measurement reports may contain signal strength or quality measurements like BER (bit error rate) or (BLER) block error rate.
  • the mobile station measures on the connection from the network towards the mobile station.
  • FIG 2 illustrates the architecture for a packet switched system such as GPRS.
  • Information packets from an external network 22 will enter the GPRS network at a GGSN (Gateway GPRS Support Node) 24.
  • the packets are then routed from the GGSN 24 via the backbone network 26 to a SGSN 28 that is serving the area in which the addressed GPRS mobile station (36) resides.
  • the packets are routed to the correct BSS (Base Station System) 30, in a dedicated GPRS transmission.
  • BSS Base Station System
  • a GPRS register may or may not be integrated with an HLR (Home Location register) of the GSM system (The HLR and GPRS register are illustrated at 32 in Figure 2).
  • Subscriber data may be interchanged between the SGSN 28 and MSC (Mobile Services Switching Center) 34 (which may be coupled to a Visitor Location Register (VLR)) to ensure service interaction, such as, for example, restricted roaming.
  • MSC Mobile Services Switching Center
  • FIG 3 schematically illustrates the handover procedure 40 for a circuit switched GSM system.
  • the serving BSS 43 advises the MSC 41 that a handover is required (HO Required 61), the MSC requests a handover from the target BSS 44 (HO Request 62) and the target BSS acknowledges the request (HO Req ack 63).
  • HO Request 61 the MSC requests a handover from the target BSS 44
  • HO Req ack 63 the request
  • resources in the target cell are allocated in advance before the mobile station leaves the old cell.
  • Information about the frequency, timeslot and output power the mobile station should use is sent in the handover command (HO Command 64,65) from the MSC 41 to the mobile station 42 via the serving BSS 43.
  • the mobile station is thus guaranteed resources in the target cell.
  • the mobile station 42 accesses the target cell (HO Access 66) and receives timing advance information from the target BSS 44.
  • the target BSS 44 notifies the MSC 41 that the handover has been detected (HO Detect 67) and the mobile station sends a handover complete message (HO Complete 68,69) to the MSC via the target BSS.
  • the handover is controlled by the network and the mobile station sends measurement reports continuously (two reports every second) on the Slow Associated Control Channel (SACCH).
  • SACCH Slow Associated Control Channel
  • Figure 4 illustrates the handover procedure 50 for the packet switched domain; specifically, for a GPRS/EGPRS based packet data communications system according to a presently preferred embodiment of the present invention.
  • the network knows that a handover has to be performed (this can, for example, be done by using the Packet SACCH (PSACCH) as described above and let the network make the handover decision based on the measurement reports received from the mobile station), and that the target cell is identified.
  • PSACCH Packet SACCH
  • the serving BSS 52 serving a mobile station 51, sends a Packet Handover Required (PHO Required 71) to the SGSN (Serving GPRS Support Node) 54, and the SGSN starts negotiating with the target BSS 56 for resources in order to fulfill the QoS-requirement (Quality of Service) for the flows concerned. If resources in the target BSS 56 are available according to the Packet Handover Request (PHO Request 72), Packet Handover Accepted (PHO Req accepted 73) is sent to the SGSN 54 from the target BSS.
  • PHO Request 72 Packet Handover Request
  • PHO Req accepted 73 Packet Handover Accepted
  • a copy of BSS context the BSS context contains e.g. QoS-parameters such as delay and throughput requirements
  • the BSS context in the serving cell is then deleted when handover is successfully performed.
  • a Packet Handover Command (PHO Cmd 74,75) is sent from the SGSN to the mobile station 51 via the serving BSS 52.
  • the Packet Handover Command may contain frequency, BSIC, a reduced Packet Uplink Assignment and/or a reduced Packet Downlink Assignment message.
  • the Handover Command is received at the mobile station, the mobile station then tunes to the target cell. Up to this time, as shown in Figure 4, normal operation is maintained between the mobile station and the serving base station such that, for example, an ongoing data transfer between the mobile station and the network through the serving base station will not be interrupted.
  • a modified Packet Polling Request is included in the Packet Handover Command.
  • the mobile station responds with a Packet Control acknowledgment ( Packet Control ack 76) (sent in four identical access bursts) transmitted on the PACCH on the new frequency to the target base station.
  • Packet Control ack 76 (sent in four identical access bursts) transmitted on the PACCH on the new frequency to the target base station.
  • the SGSN 54 is sent a packet handover detect signal (Packet HO Detect 77) whereupon the network sends a Packet Power Control/Timing Advance message (Packet PC/TA 78), also sent on the PACCH to the mobile station.
  • Packet PC/TA 78 Packet Power Control/Timing Advance message
  • transmission can be restarted in the new cell; i.e., normal operation is re-established between the mobile station and the network via the target base station as is shown in Figure 4.
  • the mobile station may acquire system information and the remaining parts of the Packet Uplink and/or Downlink Assignment messages.
  • PRACH Packet Random Access Channel
  • the present invention provides a handover procedure for packet switched communications systems that is similar to that used in circuit switched systems; while, at the same time, using the current EGPRS standard, for example, the Packet Control ack and the PC/TA messages, as much as possible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Radio Relay Systems (AREA)
  • Telephone Function (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Claims (5)

  1. Procédé de transfert d'une station mobile (42, 51) à partir d'une station de base de desserte (43, 52) à une station de base cible (44, 56) dans un système de communication sans fil à commutation de paquets comprenant un noeud de support, SGSN, caractérisé par les étapes de:
    allocation et assignation de ressources entre la station mobile (10, 51) et la station de base cible (14, 56) tout en maintenant une connexion de la station mobile (10, 51) à un réseau de système de communication à travers la station de base de desserte (12, 52), ladite étape d'allocation et d'assignation de ressources comprenant l'allocation et l'assignation de canaux de paquets qui sont partagés entre de multiples utilisateurs via la station de base de desserte (12, 52), et envoi (71) à partir de la station de base de desserte (52) d'une demande de transfert de paquets audit SGSN afin de trouver une ressource sur un canal de paquets lors de l'accès à ladite station de base cible (44, 56), ladite station de base cible acceptant (73) ladite demande si disponible,
    envoi (74, 75) à partir dudit SGSN à ladite station de base de desserte d'une commande de transfert de paquets et en outre à la station mobile;
    envoi d'un accusé de réception de commande de paquets (76) comme une réponse à ladite commande de transfert de paquets à partir de la station mobile (51) à ladite station de base cible (56), et
    envoi (77) d'un signal de détection de transfert de paquets audit noeud SGSN à partir de ladite station de base cible (56),
    ladite réponse (76) à la commande de transfert de paquets à partir de la station mobile à ladite station de base cible et ledit signal de détection de transfert de paquets (77) audit SGSN étant envoyés sur un canal de données de paquets alloué et assigné, PDCH.
  2. Procédé selon la revendication 1, dans lequel ledit canal de données de paquets PDCH comprend un canal de commande de paquets associé PACCH.
  3. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel ledit procédé comprend en outre, avant l'étape d'allocation et d'assignation, les étapes de détermination qu'un transfert de ladite station mobile (10, 51) est requis, et identification de la station de base cible (14, 56) à laquelle le transfert est à effectuer.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel ladite étape d'allocation et d'assignation (71 à 73) étant réalisée tout en maintenant une connexion de la station mobile (51) à un réseau du système de communication à travers la station de base de desserte (52) afin de fournir un transfert essentiellement sans interruption de ladite station mobile (51) à partir de la station de base de desserte (52) à ladite station de base cible (56) sans interrompre une session de transmission et de données sortantes entre ladite station mobile (10, 51) et le réseau.
  5. Procédé selon la revendication 1, et comprenant en outre l'étape d'envoi d'un message de commande de puissance de paquets / avance de temporisation (PC/TA) (78) à la station mobile (10, 51) sur le canal de données de paquets PDCH.
EP01914314A 2000-03-28 2001-03-23 Transfert dans un reseau de communication radio commute par paquets Expired - Lifetime EP1269784B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US19268600P 2000-03-28 2000-03-28
US192686P 2000-03-28
US71871300A 2000-11-22 2000-11-22
US718713 2000-11-22
PCT/SE2001/000639 WO2001074095A2 (fr) 2000-03-28 2001-03-23 Transfert dans un reseau de communication radio commute par paquets

Publications (2)

Publication Number Publication Date
EP1269784A2 EP1269784A2 (fr) 2003-01-02
EP1269784B1 true EP1269784B1 (fr) 2007-09-19

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EP01914314A Expired - Lifetime EP1269784B1 (fr) 2000-03-28 2001-03-23 Transfert dans un reseau de communication radio commute par paquets

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EP (1) EP1269784B1 (fr)
AT (1) ATE373934T1 (fr)
AU (1) AU2001239660A1 (fr)
DE (1) DE60130547T2 (fr)
ES (1) ES2293979T3 (fr)
WO (1) WO2001074095A2 (fr)

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US6990342B2 (en) * 2002-08-29 2006-01-24 Motorola, Inx. Method and apparatus for cell reselection within a communications system
US7688786B2 (en) * 2003-03-17 2010-03-30 Qualcomm Incorporated Avoiding data loss and reducing registration overhead in packet networks
US20050047368A1 (en) * 2003-08-25 2005-03-03 Kotzin Michael D. Handover during packet sessions in wireless communications networks and methods
DE102004015259B3 (de) * 2004-03-29 2005-11-10 Siemens Ag Verfahren zur Steuerung einer Verbindungsübergabe in einem Funk-Kommunikationssystem
GB0418436D0 (en) * 2004-08-18 2004-09-22 Nokia Corp Communication system
US7167459B2 (en) 2004-12-30 2007-01-23 Motorola, Inc. Inter-network handover in a packet radio system
US7920866B2 (en) * 2005-07-07 2011-04-05 Alcatel-Lucent Usa Inc. Method of hard handover in a wireless communication system
CN1933663B (zh) * 2005-09-14 2012-10-24 北京三星通信技术研究有限公司 Lte系统中支持用户设备移动性的方法
WO2008086649A1 (fr) * 2007-01-08 2008-07-24 Huawei Technologies Co., Ltd. Transmission d'informations d'état d'apprentissage à un noeud cible en déplacement
GB2454650A (en) * 2007-10-29 2009-05-20 Nec Corp Resource Allocation for persistently allocated resources
WO2011057451A1 (fr) * 2009-11-13 2011-05-19 中兴通讯股份有限公司 Procédé et système pour qu'un sous-système de station de base récupère la capacité de prise en charge de mappage de trames d'une station mobile
CN103517452B (zh) * 2013-09-29 2017-01-25 华为技术有限公司 一种业务连接建立方法及装置

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SE507432C2 (sv) * 1996-09-30 1998-06-08 Ericsson Telefon Ab L M Förfarande och enhet för distribuerad handover i upplänk
DE19916991A1 (de) * 1999-04-15 2000-10-19 Alcatel Sa Telekommunikations-System mit mehreren Funkzellen

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Publication number Publication date
DE60130547D1 (de) 2007-10-31
EP1269784A2 (fr) 2003-01-02
WO2001074095A3 (fr) 2002-01-24
ATE373934T1 (de) 2007-10-15
ES2293979T3 (es) 2008-04-01
AU2001239660A1 (en) 2001-10-08
DE60130547T2 (de) 2008-06-26
WO2001074095A2 (fr) 2001-10-04

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